Adjusted Net Yards Per Attempt (relative to average) of player's career teams, weighted by TRY w/ each team

career_wowy

The amount by which career_ranypa exceeds what would be expected from his QBs' (age-adjusted) performance without the receiver

bcs_rating

The number of yards per game by which a player would outgain an average receiver on the same team, after adjusting for teammate quality and age (update of http://www.sabernomics.com/sabernomics/index.php/2005/02/ranking-the-all-time-great-wide-receivers/)